In a manufacturing concern, the daily wages guaranteed for workers is Rs 20.

The standard output for the month is 1,000 articles, representing 100% efficiency. The rate of wages is paid without bonuses to those workers who show up to 66 2/3% efficiency. Beyond this, bonus is payable in a graded scale:.There is an increase of 1% of bonus for every 1% further rise in efficiency. Calculate the total earnings of A, B, C and D who worked 26 days in a month, with outputs 500; 900; 1,000; and 1,200 articles, respectively.

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Efficiency 90% 100% Bonus 10% 20%